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arXiv 2203.04337astro-ph.COastro-ph.GA
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具有受控再电离历史和形态的斑片状动力学Sunyaev-Zel'dovich效应

Patchy Kinetic Sunyaev-Zel'dovich Effect with Controlled Reionization History and Morphology

Nianyi Chen, Hy Trac, Suvodip Mukherjee, Renyue Cen

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20 pages, 17 Figures; comments welcome
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摘要：

使用新的半数值代码的再电离琥珀色，我们模型的补丁动力学Sunyaev-Zel'dovich（kSZ）的影响，直接指定的再电离历史的红移中点$z_\mathrm{mid}$，持续时间$Δ_\mathrm{z}$，和不对称$A_\mathrm{z}$。通过最小晕质量$M_\mathrm{h}$和辐射平均自由程$λ_\mathrm{mfp}$进一步控制电离源和辐射。AMBER再现自由电子数密度和补丁kSZ功率谱的辐射流体动力学模拟在目标分辨率（$1\,{\rm Mpc}/h$）与匹配的再电离参数。利用一套使用AMBER的$(2\,{\rm Gpc}/h)^3$模拟，我们首先使用Planck 2018 Thomson光学深度结果（95\% CL）约束红移中点$6.0<z_{\rm mid}<8.9$。然后，假设$z_{\rm mid}=8$，我们发现，$D^{\rm pkSZ}_{\ell=3000}$的振幅与再电离$Δ_z$的持续时间成线性比例，并与从南极望远镜（SPT）的结果$1σ$上限$Δ_z<5.1$（$Δ_z$包围$5\%$ $95\%$电离）。此外，较短的$λ_{\rm mfp}$可导致$\sim 10\%$较低的$D^{\rm pkSZ}_{\ell=3000}$和$Δ_z-D^{\rm pkSZ}_{\ell=3000}$缩放关系中较平坦的斜率，从而影响在$\ell=3000$处对$Δ_z$的约束。允许$z_{\rm mid}$和$λ_{\rm mfp}$同时变化，我们得到的光谱与SPT结果（$95\%$ CL）一致，直到$Δ_z=12.8$（但需要$A_z>8$以确保在$z=5.5$之前结束再电离）。我们表明，对不对称性的约束要求$\sim 0.1\,μk^2$测量精度在多极比$\ell=3000$。最后，我们发现，振幅和形状的kSZ频谱只有弱敏感$M_h$下固定的再电离历史和辐射平均自由路径。

英文摘要：

Using the novel semi-numerical code for reionization AMBER, we model the patchy kinetic Sunyaev-Zel'dovich (kSZ) effect by directly specifying the reionization history with the redshift midpoint $z_\mathrm{mid}$, duration $Δ_\mathrm{z}$, and asymmetry $A_\mathrm{z}$. We further control the ionizing sources and radiation through the minimum halo mass $M_\mathrm{h}$ and the radiation mean free path $λ_\mathrm{mfp}$. AMBER reproduces the free electron number density and the patchy kSZ power spectrum of radiation-hydrodynamic simulations at the target resolution ($1\,{\rm Mpc}/h$) with matched reionization parameters. With a suite of $(2\,{\rm Gpc}/h)^3$ simulations using AMBER, we first constrain the redshift midpoint $6.0<z_{\rm mid}<8.9$ using the Planck2018 Thomson optical depth result (95\% CL). Then, assuming $z_{\rm mid}=8$, we find that the amplitude of $D^{\rm pkSZ}_{\ell=3000}$ scales linearly with the duration of reionization $Δ_z$, and is consistent with the $1σ$ upper limit from the South Pole Telescope (SPT) results up to $Δ_z<5.1$ ($Δ_z$ encloses $5\%$ to $95\%$ ionization). Moreover, a shorter $λ_{\rm mfp}$ can lead to a $\sim 10\%$ lower $D^{\rm pkSZ}_{\ell=3000}$ and a flatter slope in the $Δ_z-D^{\rm pkSZ}_{\ell=3000}$ scaling relation, thereby affecting the constraints on $Δ_z$ at $\ell=3000$. Allowing $z_{\rm mid}$ and $λ_{\rm mfp}$ to vary simultaneously, we get spectra consistent with the SPT result ($95\%$ CL) up to $Δ_z=12.8$ (but $A_z>8$ is needed to ensure an end of reionization before $z=5.5$). We show that constraints on the asymmetry require $\sim 0.1\,μk^2$ measurement accuracy at multipoles other than $\ell=3000$. Finally, we find that the amplitude and shape of the kSZ spectrum are only weakly sensitive to $M_h$ under a fixed reionization history and radiation mean-free path.

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